How often should the soda lime in anesthesia circuits be changed?

How often should the soda lime in anesthesia circuits be changed?

• A. 6-8 hours
• B. Every 30 days
• C. When the granules change colors
• D. Weekly

Answer: (A)

Soda lime in the anesthesia circuit has a limited capacity to absorb CO2, and its effectiveness decreases as it reacts with CO2 over time. Because both the patient’s CO2 production and the fresh gas flow vary, there’s a practical need to replace the absorber at a regular interval to ensure reliable CO2 removal and to avoid potential problems if the material becomes exhausted. A common, safe guideline is to change the canister every 6–8 hours of use. The color change of the granules can hint at exhaustion, but it isn’t perfectly reliable on its own due to variations in humidity and other factors, so relying on a set 6–8 hour interval helps maintain consistent performance.

Soda lime in the anesthesia circuit has a limited capacity to absorb CO2, and its effectiveness decreases as it reacts with CO2 over time. Because both the patient’s CO2 production and the fresh gas flow vary, there’s a practical need to replace the absorber at a regular interval to ensure reliable CO2 removal and to avoid potential problems if the material becomes exhausted. A common, safe guideline is to change the canister every 6–8 hours of use. The color change of the granules can hint at exhaustion, but it isn’t perfectly reliable on its own due to variations in humidity and other factors, so relying on a set 6–8 hour interval helps maintain consistent performance.